LAN9514 datasheet(14/54 Pages) MICROCHIP

14 / 54 page

LAN9514/LAN9514I

DS00002306A-page 14

 2009-2016 Microchip Technology Inc.

2.2

Port Power Control

This section details the usage of the port power control pins PRTCTL[5:2].

2.2.1

PORT POWER CONTROL USING A USB POWER SWITCH

The LAN9514/LAN9514i has a single port power control and over-current sense signal for each downstream port. When

disabling port power, the driver will actively drive a ‘0’. To avoid unnecessary power dissipation, the internal pull-up resis-

tor will be disabled at that time. When port power is enabled, the output driver is disabled and the pull-up resistor is

FIGURE 2-2:

POWER CONNECTIONS

+3.3V

(IN)

+1.8V

(OUT)

Internal Core

Regulator

VDD33IO

+3.3V

VDD18CORE

Core Logic

VDD18USBPLL

USB PHY

1.0uF

Exposed Pad

VDD33A

VDD33IO

0.1uF

VDD33IO

0.1uF

LAN9514

VDD33A

0.1uF

64-PIN QFN

2.0A

120 ohm @

100MHz

VSS

VDD18ETHPLL

0.1uF

PLL

Ethernet PHY

0.1uF

2.0A

120 ohm @

100MHz

VDD33A

0.1uF

VDD33A

0.1uF

+3.3V

(IN)

+1.8V

(OUT)

Internal USB PLL

Regulator

4.7uF 0.1uF 0.1uF

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